Which way is on? Are the tone controls turned way up when you engage the button? If they are turned up, set them to 0 or the flat position. Just a thought.
How long have you had this preamp? Have you made any power amplifier or other changes? These are fairly old and have been known to have some cold solder issues.
I too have the same hum problem with my RGR 4. It is only on the right channel. For awhile I have been plagued by a right channel hum coming from my Sumo Andromeda amp. I was resigned to replacing one or both power supply caps. After reading your post I tried the RGR 4's tone button. Voila, pushed it in and hum GONE! That's a lot of worry gone! I really like the Andromeda with the DCM Time Windows and will continue to use it! The RGR 4 also sounds fine - as long as I leave the tone button pushed in!
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